US Patent: 540,140
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| Power Hammer
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Patentees:
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| Royal B. Boynton (exact or similar names) - West Townsend, Middlesex County, MA |
| Daniel L. Chandler (exact or similar names) - Ayer, Middlesex County, MA |
| Frank E. Tenney (exact or similar names) - Ayer, Middlesex County, MA |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
May 18, 1894 |
| Granted: |
May 28, 1895 |
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Joel Havens
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